title: One year follow-up after cryoballoon isolation of the pulmonary veins in patients with paroxysmal atrial fibrillation.
abstract: OBJECTIVE
  Pulmonary vein isolation (PVI) with cryoenergy delivered through a balloon is a new approach in the treatment of atrial fibrillation (AF), but long-term follow-up is lacking. The aim of this study was to provide insight in the success rate and the incidence of recurrences.
  
  
  RESULTS
  Patients with symptomatic AF despite anti-arrhythmic drugs (AADs) were treated with cryoballoon PVI. Daily transtelephonic ECG monitoring, 24 h Holter-ECG, and an arrhythmia-focused questionnaire were used to document AF. One hundred and forty-one patients completed a follow-up of 457 +/- 252 days. Before ablation, Holter-ECG showed AF in 45%, including 16% continuous AF throughout the recording. Event recording revealed a median AF burden of 26%. The questionnaire showed a median of weekly AF complaints lasting for hours. All but one patient had successful PVI with a single procedure. After ablation, AF (defined as lasting for more than 30 s) was seen in 11% of Holter-ECGs, with 1% continuous AF. The event recording showed an AF burden of 9%. The median patient reported no more AF-related symptoms. Recurrence during the first 3 months was predictive for later recurrence. A second procedure was performed in 24 patients. The freedom of AF was 59% without AADs after 1,2 procedures. Four right phrenic nerve paralyses occurred, all resolving within 6 months. No PV stenoses were observed.
  
  
  CONCLUSIONS
  Pulmonary vein isolation with a cryothermal balloon is an effective treatment for paroxysmal AF, resulting in a clinical success rate comparable to studies involving radiofrequency ablation. Temporary right phrenic nerve paralysis is the most important complication.
authors.affiliation: Department of Cardiology, Clinical Electrophysiology Unit, Thoraxcentre, Erasmus Medical Centre, Rotterdam, The Netherlands. y.vanbelle@erasmusmc.nl
authors.forename: Yves
authors.initials: Y
authors.lastname: Van Belle
authors.forename: Petter
authors.initials: P
authors.lastname: Janse
authors.forename: Dominic
authors.initials: D
authors.lastname: Theuns
authors.forename: Tamas
authors.initials: T
authors.lastname: Szili-Torok
authors.forename: Luc
authors.initials: L
authors.lastname: Jordaens
mesh_terms: D001281:Atrial Fibrillation / Q000601:surgery*; D002404:Catheterization / Q000379:methods*; D003452:Cryosurgery / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006329:Heart Conduction System / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011667:Pulmonary Veins / Q000601:surgery*; D016896:Treatment Outcome